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[perl #30518] memory corruption compiling malformed program

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From:
andrew @ pimlott . net
Date:
June 29, 2004 00:51
Subject:
[perl #30518] memory corruption compiling malformed program
Message ID:
rt-3.0.11-30518-91579.8.14544964413621@perl.org
# New Ticket Created by  andrew@pimlott.net 
# Please include the string:  [perl #30518]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org:80/rt3/Ticket/Display.html?id=30518 >



This is a bug report for perl from andrew@pimlott.net,
generated with the help of perlbug 1.34 running under perl v5.8.3.


-----------------------------------------------------------------
[Please enter your report here]

This program crashes my perl during compilation (ie, when run with -c).
It's fairly sensitive to the details: removing one of the my variables, the
right side of the assignment, or the prototype all cause perl to give an
appropriate syntax error.

    sub bar (&);
    sub foo {
        my ($a, $b) = @_;
        bar sub { and };
    }

This is the backtrace from debugperl in the Debian perl-debug package.  (I
don't know why it doesn't have line numbers.)

    #0  0x080a2aa9 in Perl_pad_free ()
    #1  0x0808f59d in Perl_op_clear ()
    #2  0x0808f4c0 in Perl_op_free ()
    #3  0x0808f48f in Perl_op_free ()
    #4  0x080984ef in Perl_newATTRSUB ()
    #5  0x0808d168 in Perl_yyparse ()
    #6  0x08062687 in S_parse_body ()
    #7  0x00000001 in ?? ()
    #8  0xbffff88c in ?? ()
    #9  0x0816c2a0 in ?? ()
    #10 0xbffff6d4 in ?? ()
    #11 0x00000020 in ?? ()
    #12 0x00000020 in ?? ()
    #13 0x080b5aad in Perl_my_setenv ()
    Previous frame inner to this frame (corrupt stack?)

Andrew

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.8.3:

Configured by Debian Project at Sat Mar 27 17:07:14 EST 2004.

Summary of my perl5 (revision 5.0 version 8 subversion 3) configuration:
  Platform:
    osname=linux, osvers=2.4.25-ti1211, archname=i386-linux-thread-multi
    uname='linux kosh 2.4.25-ti1211 #1 thu feb 19 18:20:12 est 2004 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.3 -Dsitearch=/usr/local/lib/perl/5.8.3 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.3 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='3.3.3 (Debian 20040314)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=true, libperl=libperl.so.5.8.3
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.3:
    /home/andrew/lib/perl
    /home/andrew/local/lib/perl
    /etc/perl
    /usr/local/lib/perl/5.8.3
    /usr/local/share/perl/5.8.3
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8
    /usr/share/perl/5.8
    /usr/local/lib/site_perl
    .

---
Environment for perl v5.8.3:
    HOME=/home/andrew
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/andrew/bin:/usr/sbin:/sbin:/home/andrew/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
    PERL5LIB=/home/andrew/lib/perl:/home/andrew/local/lib/perl
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh


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